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Hypertext Help with LaTeX

\rule

The \rule command generates a rectangular "blob of
ink." It can be used to produce horizontal or vertical lines.
The arguments are defined as follows.

raise-height specifies how high to raise the rule (optional)

width specifies the length of the rule (mandatory)

height specifies the height of the rule (mandatory)

The default value for raise-height is zero; a
negative value lowers the rule.

The reference point of the rule box is the lower left-hand corner.

A rule box of zero width may be used as a "strut" which is
invisible but which causes LaTeX to adjust veritcal spacing to
leave room. This can be particularly useful where the
\vspace command cannot be
used, for example, within
mathematical formulas.